Generation current of charged micelles in nonaqueous liquids: Measurements and simulations

Filip Strubbe, Alwin R.M. Verschueren, Luc J.M. Schlangen, Filip Beunis, Kristiaan Neyts

Research output: Contribution to journalArticleAcademicpeer-review

72 Citations (Scopus)

Abstract

Electrically charged species in nonaqueous media still hold many questions. Recent studies and applications show the need for a better understanding of the origin and nature of these charged species. Transient current measurements have been used to study the conductivity of nonaqueous liquid containing charged inverse micelles. At small time scales (1-100 ms) drift and diffusion of charged species are the main contributions to the measured current. At larger timescales (above 1 s) a nonzero quasi steady-state current at high voltages (above 0.5 V) remains. This indicates that besides drift and diffusion an additional process occurs. The dependence of the quasi steady-state current on the applied voltage, micelle concentration, and device thickness has been investigated. Experimental results have been compared to simulations and analytical calculations. It is concluded that the quasi steady-state current results from a bulk disproportionation reaction between neutral micelles that generates charged micelles. And therefore this technique allows for direct quantification of the reaction kinetics from which the charged species originate.

Original languageEnglish
Pages (from-to)396-403
Number of pages8
JournalJournal of Colloid and Interface Science
Volume300
Issue number1
DOIs
Publication statusPublished - 1 Aug 2006
Externally publishedYes

Keywords

  • Disproportionation
  • Electrical charges
  • Electrophoretic displays
  • Generation
  • Nonaqueous media
  • Transient current

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